[vsnet-grb-info 2451] GRB 051117B: Refined analysis of the Swift-BAT burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4288
SUBJECT: GRB 051117B:  Refined analysis of the Swift-BAT burst
DATE:    05/11/17 20:41:10 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at lheamail.gsfc.nasa.gov>

A. Parsons (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (GSFC/UMD), K. Hurley (Berkeley), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), J. Norris (GSFC), D. Palmer (LANL),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

Using the full data set from the recent telemetry downlink,
we report further analysis of Swift-BAT GRB 051117B (trigger #164279)
(Band, et al., GCN 4281).  The ground-analysis position is
RA,Dec 85.187,-19.280 {05h 40m 44.9s,-19d 16' 48.5"} (J2000)
with an uncertainty of 2.5 arcmin (radius, 90%, stat+sys).
T90 is 8 +- 1 sec.  The partial coding fraction is 73%.
The lightcurve has a bump of ~10 sec in duration with a peak at T+1 sec.
Fitting a simple power law over the full interval from T-0.3 to T+7.5 sec,
the photon index is 1.7 +/- 0.3 with a fluence of 1.4 +/- 0.3 X 10^-7 erg/cm^2.
The peak flux in a 1-sec wide window starting at T+1.4 sec
is 0.46 +/- 0.15 ph/cm^2/sec.  All values are in the 15-150 keV band
at the 90% confidence level.